CN211175437U - Air-tight seal gate valve - Google Patents

Abstract

The utility model provides an airtight gate valve, including valve body and valve plate, in the space that the inner wall of valve body surrounded the formation is worn to locate by the valve plate activity, the valve body communicates in medium passage in the activity direction vertically direction with the valve plate, and it includes: the sealing ring is arranged on the inner wall in a surrounding mode, surrounds a through hole formed at the communication position of the medium channel and the valve body, is tightly attached to the inner wall by two side wings of the sealing ring, and a hollow part capable of being filled with gas is formed between the two side wings of the sealing ring; the air passage is arranged on the valve body and communicates the hollow part to the outside; the first pressing plate is arranged on the inner side of the sealing ring, and at least one part of the first pressing plate is overlapped on a side wing on the inner side of the sealing ring. The flank of the sealing ring is buckled and pressed on the inner side of the sealing ring through the first pressing plate, and the first pressing plate is fixed from the outside of the sealing ring, so that the contact surface of the sealing ring and the inner wall of the valve body is not easy to be impacted by gas and the like.

Description

Air-tight seal gate valve

Technical Field

The utility model relates to an airtight gate valve.

Background

At present, a sealing gate valve is mainly used for storing media such as materials or gases, and the structure of the sealing gate valve generally comprises a control assembly and a valve body assembly. The cylinder drives the valve plate in the valve body assembly to lift in the medium channel through the piston rod under the control of the control assembly, and the valve is switched on and off. In the valve body assembly, the valve plate is radially arranged on the medium channel, and in order to ensure the sealing between the medium channel and the surface of the valve plate, two surfaces of the valve plate are usually required to be respectively sealed in an interference manner by a rubber sealing ring so as to prevent the material in the medium channel from leaking. The sealing gate valve with the existing structure can cause valve failure when leakage is generated due to the fact that the sealing gate valve is washed by high-speed moving media due to the particularity of a working environment, and on the other hand, the valve plate is seriously abraded when lifted or opened and closed.

In view of this, document 1 (chinese patent, publication No. CN201795068U) discloses a soft seal gate valve, which includes a cylinder, a control assembly, and a valve body assembly; in the valve body assembly, a valve body is in a symmetrical left part and a symmetrical right part, a medium channel is arranged at the lower part of the valve body, two rubber sealing rings are radially arranged on the peripheral valve body wall of the medium channel, a gap between the two rubber sealing rings is a valve plate lifting channel, the upper end of the valve plate is connected with a piston rod in a cylinder, the rubber sealing rings are arranged in an annular groove of the valve body wall, a sealing ring framework is arranged at the bottom of the annular groove, and the rubber sealing rings are wrapped on the sealing ring framework; and the sealing ring framework is provided with an air delivery hole communicated with the air cylinder. After double-sided inflation soft sealing is adopted, two inflated and expanded rubber sealing rings are tightly pressed on two sides of the valve plate to form two sealing ring belts.

In the scheme of document 1, a seal ring framework is used as a supporting component of a rubber seal ring, and when a valve plate is displaced to a sealing position, air is input through an air transmission hole in the seal ring framework to enable the seal ring to be expanded and then sealed with the valve plate in an interference manner. However, since the sealing ring framework is arranged inside the rubber sealing ring, when the sealing ring is impacted by a medium after sealing is completed, the stress of the rubber sealing ring is concentrated on one side where the medium exists, a large shearing force can exist between the rubber sealing ring and the sealing ring framework at the moment, and the rubber sealing ring is very easy to damage on the side due to uneven stress.

On the other hand, the setting of sealing washer skeleton can lead to increasing the ditch on the valve body and return, not only can increase the cost of manufacture, and the wearing and tearing result and the medium of rubber seal in the use get into behind the sealing washer skeleton, very difficult clearance.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to set up the sealing washer skeleton in rubber seal in order to overcome current airtight gate valve and lead to the easy impaired defect of rubber seal, provide a sealing washer durability better, be convenient for install clear airtight gate valve.

The utility model discloses an above-mentioned technical problem is solved through following technical scheme:

the utility model provides a gas seal gate valve, gas seal gate valve includes valve body and valve plate, the valve plate activity is worn to locate in the space that the inner wall of valve body surrounded and is formed, the valve body with communicate in medium passage in the direction of the activity direction vertically of valve plate, its characterized in that, it includes: the sealing ring is arranged on the inner wall in a surrounding mode, a through hole formed in the communication position of the medium channel and the valve body is surrounded by the sealing ring, two side wings of the sealing ring are attached to the inner wall in a sealing mode, and a hollow part capable of being filled with gas is formed between the two side wings of the sealing ring; the air passage is arranged on the valve body and communicates the hollow part to the outside; the first pressing plate is arranged on the inner side of the sealing ring, and at least one part of the first pressing plate is overlapped on a side wing on the inner side of the sealing ring.

Preferably, a second pressing plate is annularly arranged on the outer side of the sealing ring, at least one part of the second pressing plate is overlapped on the lateral wing on the outer side of the sealing ring, and the first pressing plate and the second pressing plate are fixed to the inner wall through fasteners, so that the lateral wings on the inner side and the outer side of the sealing ring are respectively fastened by the first pressing plate and the second pressing plate.

Preferably, the sealing ring forms a raised shape at the hollow portion when not inflated with gas.

Preferably, a sealing gasket is clamped between the sealing ring and the first pressure plate.

Preferably, an annular protruding portion is arranged on the valve plate and corresponds to the sealing ring.

Preferably, the first pressure plate and the second pressure plate are fixed to the inner wall through bolts.

Preferably, the first pressing plate has a thickness, and the sealing ring forms a raised shape higher than the thickness at the hollow portion when not filled with gas.

The utility model discloses an actively advance the effect and lie in: the flank of the sealing ring is buckled and pressed on the inner side of the sealing ring through the first pressing plate, and the first pressing plate is fixed from the outside of the sealing ring, so that the contact surface of the sealing ring and the inner wall of the valve body is not easy to be impacted by gas and the like, and the stress on the side surface of the sealing ring is reduced.

Drawings

Fig. 1 is a schematic structural view of the airtight gate valve according to the preferred embodiment of the present invention.

Fig. 2 is an enlarged view of a portion of a dotted line frame a in fig. 1.

Detailed Description

The present invention will be more clearly and completely described below by way of examples and with reference to the accompanying drawings.

Fig. 1 is a schematic structural view of the airtight gate valve of the present embodiment. Fig. 2 is an enlarged view of a portion a in fig. 1. As shown in fig. 1 to 2, the airtight gate valve 100 according to the present embodiment includes a valve body 20, a valve plate 10, and 2 sealing rings 31.

The valve plate 10 is movably inserted into a space surrounded by an inner wall 21 of the valve body 20, and the valve body 20 is communicated with the medium passage in a direction perpendicular to a moving direction of the valve plate 10. As shown in FIGS. 1-2, the media passes through the media path and through the valve body 20 in the direction D (dashed arrow D in FIGS. 1-2). The sealing ring 31 is arranged on the inner wall 21, the sealing ring 31 surrounds a through hole formed at the communication part of the medium channel and the valve body 20, two side wings of the sealing ring 31 are closely attached to the inner wall 21, and a hollow part capable of being filled with gas is formed between the two side wings of the sealing ring 31.

The valve body 20 is provided with an air passage for communicating the hollow portion of the seal ring 31 to the outside. As shown in fig. 2, a gas nozzle 32 for receiving a gas source is disposed on an outer wall of the valve body 20, and when gas needs to be filled into the sealing ring 31, the gas enters the gas passage through the gas nozzle 32 and then enters the hollow portion of the sealing ring 31.

The valve plate 10 is provided with a projection 11 at a position corresponding to the seal ring 31. That is, the hermetic seal gate valve 100 blocks or releases the medium moving in the direction D by controlling the position of the valve plate 10. At the connection between the valve body 20 and the medium passage, a through hole (or opening) is formed for the medium to enter or exit the valve body. The seal ring 31 is disposed annularly on the outer periphery of the through hole and surrounds the through hole.

When it is required to close the airtight valve gate 100, the connecting rod coupled to the valve plate 10 is pushed to cause the valve plate 10 to penetrate into the space surrounded by the valve body 20. When valve plate 10 reaches a predetermined position, annular projection 11 on valve plate 10 is aligned with sealing ring 31. At this time, there is a certain distance between the uninflated sealing ring 31 and the protruding part 11, and after the hollow part of the sealing ring 31 is inflated and protrudes, the protruding part of the sealing ring 31 is closely attached to the protruding part 11, and the sealing operation is completed. The medium is blocked from flowing by being blocked by the valve plate 10.

Further, a first presser plate 33 is provided inside the seal ring 31, and at least a part of the first presser plate 33 is superposed on the inner side wing of the seal ring.

In this embodiment, the first presser plate 33 is formed in a circular ring shape having an outer diameter smaller than that of the seal ring 31 and an inner diameter larger than that of the through hole. The outer edge of the first pressure plate 33 directly or indirectly butts against the side edge and the flank of the sealing ring 31, so that the part of the sealing ring 31, which is attached to the inner wall of the valve body, is protected. In addition, when the sealing ring needs to be replaced or cleaned, only the first pressure plate and other parts need to be taken down, most of the surface of the inner wall can still be kept smooth, and the cleaning is facilitated.

The outside ring of sealing washer 31 is equipped with second clamp plate 35, and second clamp plate 35 passes through the fastener to be fixed to inner wall 21, and at least a part of second clamp plate 35 overlaps and establishes on the flank in the outside of sealing washer, and first clamp plate, second clamp plate pass through fasteners such as bolt and fix to inner wall 21 for the flank of the inside and outside of sealing washer is fastened by first clamp plate 33, second clamp plate 35 respectively. Similarly, the second presser plate 35 is provided in an annular shape having an inner diameter larger than the outer diameter of the seal ring 31.

The packing 31 is formed in a hollow portion in a bulged shape when not filled with gas. Due to the arrangement, when the sealing ring 31 is switched between an inflation state and a non-inflation state, the deformation and stretching position is specific, and the service life of the sealing ring is prolonged.

A gasket 34 is interposed between the seal ring 31 and the first presser plate 33. That is, the seal ring 31 and the first presser plate 33 do not necessarily have to be in direct contact, but may be provided with a gasket 34 interposed therebetween. The gasket is arranged to further reduce the impact of the medium impact or the stress in most cases on the joint of the sealing ring 31 and the inner wall 21 from the side of the first pressure plate.

Further, the first presser plate 33 is fixed to the inner wall 21 by bolts. The first presser plate 33 has a thickness above which the packing 31 forms a ridge shape at a hollow portion when not filled with gas. Because the sealing ring forms a bulge in an uninflated state, when the hollow part of the sealing ring is switched between an inflated shape and an uninflated shape, the deformation is mainly concentrated on two sides of the sealing ring. The height of the raised shape of the sealing ring 31 when the sealing ring is not inflated is larger than the thickness of the first pressing plate, and the deformed parts at the two sides of the sealing ring are not easy to rub or interfere with the first pressing plate when the sealing ring is inflated.

Furthermore, since the connection of the medium channel to the valve body 20 results in two through-openings (openings), namely a through-opening for the medium to enter and a through-opening for the medium to exit, both sealing rings and the first and second pressure plates can be arranged in the manner described above on both through-openings.

Although particular embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are examples only and that the scope of the present invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are all within the scope of the present invention.

Claims (7)

1. The utility model provides a gas seal gate valve, gas seal gate valve includes valve body and valve plate, the valve plate activity is worn to locate in the space that the inner wall of valve body surrounded and is formed, the valve body with communicate in medium passage in the perpendicular direction of activity direction of valve plate, its characterized in that, it includes:

the sealing ring is arranged on the inner wall in a surrounding mode, a through hole formed in the communication position of the medium channel and the valve body is surrounded by the sealing ring, two side wings of the sealing ring are attached to the inner wall in a sealing mode, and a hollow part capable of being filled with gas is formed between the two side wings of the sealing ring;

the air passage is arranged on the valve body and communicates the hollow part to the outside;

the first pressing plate is arranged on the inner side of the sealing ring, and at least one part of the first pressing plate is overlapped on a side wing on the inner side of the sealing ring.

2. The hermetic seal gate valve according to claim 1,

a second pressure plate is annularly arranged at the outer side of the sealing ring,

at least one part of the second pressure plate is overlapped on the lateral wing at the outer side of the sealing ring,

the first pressure plate and the second pressure plate are fixed to the inner wall through fasteners, so that the side wings on the inner side and the outer side of the sealing ring are fastened by the first pressure plate and the second pressure plate respectively.

3. The hermetic seal gate valve according to claim 2,

the sealing ring forms a raised shape at the hollow portion when not inflated with gas.

4. The hermetic seal gate valve according to claim 3,

and a sealing gasket is clamped between the sealing ring and the first pressing plate.

5. The hermetic seal gate valve according to claim 4,

and an annular protruding part is arranged on the valve plate at a position corresponding to the sealing ring.

6. The hermetic seal gate valve according to claim 5,

the first pressure plate and the second pressure plate are fixed to the inner wall through bolts.

7. The hermetic seal gate valve according to claim 6,

the first pressure plate has a certain thickness, and the sealing ring forms a raised shape higher than the thickness when not filled with gas at the hollow part.

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